Furnace-door frame



W. H. STEWART.

FURNACE DOOR FRAME AFPLlCATlON FILED JUNE 5, I919.

1 ,333,225 Patented Mar.- 9, 192 0.

* aseam sweepsasses e -1i Be itkno'wnthatI, WILLIAM k a citizen of ithe United States; residing-fiat lvo'reester, inthecounty of Worcesterand State of -Massa chusett s; have invented a "new and-useful Furnace-Door Frame, of-

which the following isa specification.

' Thisginvention relates to theframe forthe door-ofa furnace and, 'whilecap'able of 10' t I "find can be remedied in part bv cooling theadjacentsurfaces of=the cast iron and steel. This I find can be accomplished.- con veniently by-introducing airzto support com bustion in a new way'be'tw'eenthese surfaces so as to keep them' always in a co'mparativ y cool condition. \J

The cast iron frames are of courseisome 1 what irregular on their surfaces which come into contact with thesteelplates .andthis in "f i 'vention, has for-another object to reducepli d to it; .457

' the rear on the line 3-3 of Figs- 2s eff tivelv.

these irregulari ies and conseql' entlv the difficul ies which they present, This'I ac- 30 omnlish .bv arranging the cast iron frame; in such a wavthat it will'bear, on the steel front of the furnace over' a much' smaller area than heretoforet and'I alsoprovide an improved arrangement for" the fastening means bv which the frame will be held more Further objects and advantages ofthe in vention will appear hereinafter.

Reference is to he hadto the'accompanying drawings, in which V Figure 1 is a front view ofa part of a furnace showing the door frame with a preferred embodiment of this invention "apf i Fig. 2 is a sect onal view of the same'on theline 2-2 of Fig. 1 on enlarged scale;

Fig. 3 is a sectional view looking in from Fig. 4 is'a-sectional view on the line=44 of Fig. 1: and

Fig. 5 is a framnentarv 'olan looking in the d rectinn fl thearrow 5 in Fig. 4.. t

Although this invention is not limited to aDDlication to steel frontfurnaces I have, shown it as applied to a furnace having a front made up of ma plates 10,- These as swam. f

i i i :Specilication oif Letters ltatenti "ippucam-aa nae-5; 1919 *S'eiial'nbi 3,01 ,876.

11 which, instead offhaving a flange which fits against-the front surfaces of the plates 10, is provided with a flange 12 spaced from this surface; This provides an air space 13 5 surrounclingfhe do'or" opening. This space is bounded' ontheio'utside bv an inwardly extending rib, 14 provided with'anumber of -V notches '15'in itsedge, These notches-are] g-1.920;; a a

fusual ha've anopening forthe door. Sur

rounding this open ng is a cast lron frame;

provided to permit-the entrance of ai r into i,

theyspace 'l '3 andj the rib-14 is provided -to* bear on I the front surfaces of the plates 10; On the inner side the; frame -11] is provided with a fl'antzelfi having'a pluralityofnotches equally spaced around itQnone being provided on the bottom, which is con tinuous so as to"prevent the entrance-of;- ashes lnto the airspace underneath, The

notches 15 and 17'are sp'ac'ed at convenient distances apart and are not usually in regi's ,7

'trationwith eaeh otheraso' that the air passf ing through will-have to take a more or-l'ess sinuous course.

- An other featureeonsists in the fact' that the bolts 18 whi'c'hz-lfasted the frame tothefrontplates -pass through the space 13 so" thatzif there is a le s int to h c t rnetalthev'will hold the edo'e of the rih 14 firmlv in "contact with the front nlates10 and a'oplv'thenressure all aroundthenerii'oh erv of the frame -soas to secure a 'firm joint at thiscpointflf 7' In or ert'oavoid anv undue lo nd n' either of the fl n e 12 or theinuer: ed e of the plates 10 "t ese bol s are'nre erahlv V 1 guarded on each sidefhv luosfl9 nreferahlvl cast integrallv with the-frame; The e luqs donot extend o ite to'tlie surfaces of the.

plate 10 normallyQbut in case of anv'vielding thev will serve as abu ments to prevent its 'beino' excessive and will hold 10 and fl nge 12 apart.

- It is toloe noted that the flange, 16 extends in bevondthe edge of the flan e 14. so that its inner edge will be sub tantiallv flush cwith t e inner surface of'jt eb i erfront .10, The door 20, is fa tened to this frame 11 bv the usual hingesQl which need not be des ribed. in detail. .1

lt will be seen that the frame is easily the plates castfand' that on account of the specific co n-7 struction illu trated it is considerably lie'hter'in' we ght than hasbeen the case" heretofore. ;This' affords convenience in is hand i g and' a s ing of metal, It is l q 'more firmly united to the boiler front on, ac-

, count of the construction described above e and illustrated especia'llyin' Fig: 4',"and' af-' fords a circulation of air through the notches" 15 into the space 13 and through the notches 17 into the fire box. Thiswill afl'ordthe" air ne'cess'ary to sup ort combustion in the con-f junction with the usual. shutter 22;. Thenotches. 17 also tend to prevent cracking due to expansion and contraction as they yield and take up the variation.

fOI'BJ V i I a I I am aWareiof-the. fact that the invention is applicable to furnaces having cast iron fronts-as Well assteelones,-but it has some art Without departing from'the scope of the invention as expressedin theclairns. There fore I do not Wish to be limited; to 1 all the 7 details of- ,const-ruetion herein shown and additionaladvantages as? stated above. when usedin I the latten .olass' offurnaces. I

' 1 Although lahave illustrated; anddescriloed a a specific embodimentofathe invention'l am aware of the fact thatinodifications can be made thereinby any person skilled in the described, but What I do clai1n-vis:

1. An annular frame for; a furnace door having a flat flange spacedlfroin the? front of" the furnace and provided with an inte-i 'gral jinarginal rilo surrounding it and spaced from the edge 'ofthe door opening, said rihhaving ase'ries of notches 'in its edge and Y i the frame having an'integral inner Wall extending 'froin the outer surface of the frame inwardly jallflaround past said flange and then straight in from the flange to iayplane 'just inside the door opening and having notches in its undermost edge. 2. In a furnace, the-comb1nat1on With a) steel furnace fronthaving door opening,

of aca'st iron door frame, having a periph eral rfiange engaging the: front-surface of: the steel front: at a distancefrointhe edge-of the door.opening,rconetitutingithe oulyline of contactfbefvveen; front-and? frame, and

having'pairs of integral cast"; lugs located onthe inside surface 0f. sa1dfflange"1n po- 7 sitionto almost touch the steel front,- andfastening device's extending through the; front and frame: between said lugs to hold the edge of, the flange firmly against the furnace'front'. a ,1

3. *In a furnace, the combination with a furnace front having a door opening,;ofa' door frame having a flange engaging the' front surface of the front at adistance from the edge of the door" opening; and having pairs of lugs located-adj acentto eaclr other on the;.inside of: said fiange in positionto almost touch the steel front and a fasten:

ing device extending through the front and frame hetiveenlugsof-each palr; V x

In testimony whereof I have: hereuntoaflixed my. signature.

. 1 WILLIAM HQSTEWABT. V 

